As Jersey City mourns a police officer, others grieve for a cop killer.

On Orient Avenue sits a memorial to Lawrence Campbell, the man who fatally shot Officer Melvin Santiago early Sunday morning.

About two dozen candles and an assortment of empty liquor bottles sit on the sidewalk. Above them, two white t-shirts fixed to the red brick wall feature messages to Campbell scrawled with black markers.

"He was a good man," Jones said. "He looked out for everybody on the block."

Jones said she couldn't reconcile the Campbell she knew with the Campbell who city officials say lay in wait for police to arrive at the Walgreens yesterday before opening fire on them.

"I don't know nothing of that," she said. "I don't see him like that."

A woman who said she was Campbell's mother also paid a visit to the memorial yesterday morning. Identifying herself only as Mrs. Campbell, she said she doesn't believe her son is responsible for Santiago's death.

"He didn't do it," she said. "That's not Lawrence."

Gesturing to the memorial, she added, "This is Lawrence right here."

The sidewalk shrine was blasted by the heads of the city's two police unions.

"What kind of society do we live in where memorializing a violent murderer is acceptable?" a statement from Officer Carmine Disbrow and Sgt. Robert Kearns reads. "Our hope in the coming days is that all attention will be directed towards the bravery of our lost brother, Patrolman Melvin Santiago."